X = low-energy lamp
y = high-energy lamp
1) 4x + 5y
2) 120= 4x + 5y
        
                    
             
        
        
        
Answer:the z score is - 1
Step-by-step explanation:
Assuming a normal distribution for the delivery time of sandwiches by Sammy's Sandwich Shop. We would apply the formula for normal distribution which is expressed as
z = (x - u)/s
Where
x = delivery times
u = mean delivery time
s = standard deviation
From the information given,
u = 25 minutes
s = 2 minutes
We want to determine the z-score for the number of sandwiches delivered in less than 23 minutes. It becomes
z = (23 - 25)/2 = - 1
 
        
             
        
        
        
Answer:

Step-by-step explanation:














 
Hope this is correct and helpful 
HAVE A GOOD DAY! 
 
        
                    
             
        
        
        
The change of the cost changes when the pounds of ham changes. When the pounds of ham is 0, it costs 0 dollars. When the pounds of ham is 3, it costs 12 dollars. The cost changes consistently with the pounds of ham. They change together. Every time the pounds of ham goes up by 3, the cost goes up by 12.
 
        
             
        
        
        
7526.44 because you look at the thousanth place (the 2) and since it is less than 5 you round down